ApplicationCâu 55 / 100
What typically causes 'runs' or 'sags' in a paint film?
a.Applying too little paint
b.Applying the coating too heavily so it flows downward before it can set
c.Painting in cold weather only
d.Using too short a nap
Giải thích
Runs and sags occur when too much paint is applied in one pass and gravity pulls the excess down before it sets. They are prevented by applying proper film thickness, maintaining spray distance and speed, and back-brushing or back-rolling. Sags can be brushed out while wet or sanded and recoated once dry.
Luyện miễn phí toàn bộ 100 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- Why should exterior painting generally NOT be done when the surface temperature is below the coating's minimum application temperature?
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- What is a 'holiday' in spray or brush application?
- What causes 'orange peel' texture in a sprayed finish?
- Why is maintaining a 'wet edge' important when brushing or rolling large walls?
- When rolling a wall, what technique helps achieve even coverage and hide roller marks?
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